As the error was done by the god Indra, he grants Hanuman a desire that his entire body could be as sturdy as Indra's Vajra, and that his Vajra may also not hurt him. As well as Indra other gods have also granted him wishes: the God Agni granted Hanuman https://prspotlightonline.blogspot.com/2024/08/the-significance-of-hanuman-jayanti.html